James,
On
On 20 Jul 2017, at 19:06, James Holton
mailto:jmhol...@slac.stanford.edu>> wrote:
In my experience you need at least an average of 1 photon/pixel/image before
even the best data processing algorithms start to fall over.
I do not agree… both XDS and DIALS will (today) to pretty well
@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] Fine Phi Slicing
An important aspect of fine phi slicing that has not been mentioned yet (and
took me a long time to figure out) is the impact of read-out time.
Traditionally, read-out time is simply a delay that makes the overall data
collection take longer
An important aspect of fine phi slicing that has not been mentioned yet
(and took me a long time to figure out) is the impact of read-out time.
Traditionally, read-out time is simply a delay that makes the overall
data collection take longer, but with so-called "shutterless" data
collection th
And the instrument makers (e.g., Rigaku and Bruker) currently sell multi-axis
goniostats for in-house data collection--and not just for small-molecule
purposes.
Diana
P.S. Ron, we still call 'em goniometer heads and goniostats at UT Southwestern.
> On Jul 14, 2017, at 1:00 PM, "stenk...@u.wash
I'm not understanding much of this discussion, but I've noticed the use of
words reminiscent of old issues concerning omega-two theta scans on four-circle
goniostats (see Stout and Jensen, pages 168-173, second edition).
p.s. In my upbringing, crystals were placed on goniometer heads so they c
hi folks
Just my two ha'porth - the small molecule crystallographers have been doing
multi-orientation data collections since they moved from point detectors to
area detectors in the early 1990's, for the very reasons that Gerard gives
(their cusps are huge compared to ours...). Since they were
Dear Leo,
What seems to have happened is that an existing thread where fine
phi (actually: omega!) slicing was discussed, among many other things,
digressed into a discussion of data collection protocols using more
than one instrumental setting (either using a 2-theta motion of the
detector,
Reading back my email, when I mentioned 'just introduced', it is not giving
justice to the reality and those who came up with the concept. I should have
mentioned 'just reminded us', as the concept has been introduced quite a long
time ago and few tens of communications. It is therefore a remind
om: graeme.win...@diamond.ac.uk [mailto:graeme.win...@diamond.ac.uk]
> Sent: Friday, July 14, 2017 1:37 AM
> To: Keller, Jacob
> Cc: ccp4bb@jiscmail.ac.uk
> Subject: Re: [ccp4bb] Fine Phi Slicing
>
> Jacob
>
> If you have a complete 360 deg data set and your sample is still
Just to comment on what Graeme just introduced. We (and I know we are not the
first ones and not the only ones) are pushing our user community towards this
procedure as a standard: lowering the transmission (less juicy, yet...) and
getting few data with various chi. It does help greatly in getti
y, July 14, 2017 1:37 AM
To: Keller, Jacob
Cc: ccp4bb@jiscmail.ac.uk
Subject: Re: [ccp4bb] Fine Phi Slicing
Jacob
If you have a complete 360 deg data set and your sample is still alive, and you
have a multi-axis gonio, I would recommend rotating the crystal about the beam
(ideally by ~ maximum
Jacob
If you have a complete 360 deg data set and your sample is still alive, and you
have a multi-axis gonio, I would recommend rotating the crystal about the beam
(ideally by ~ maximum scattering 2-theta angle) and collecting again. This
would record your blind region as well as moving the re
Hi Fred,
fine slicing does not alleviate the count RATE limitation of photon
counting detectors because fine slicing does not reduce the
instantaneous photon flux on the detector when you cross the diffraction
maximum. Fine slicing does help if you push the maximum counts per pixel
per frame
I could be wrong here, but isn't the case that fine slicing is an option
with a CCD and a necessity on a PAD b/c of dead time and/or counter dynamic
range
issues?
(no current and/or former financial ties to any manufacturer)
Fred
[32m
I thought there was a new paper from the Pilatus people saying fine slicing is
worth it even beyond the original 1/2 mosaicity rule?
I would think, actually, more gains would made by doing light exposures at,
say, 1/3 mosaicity, collecting 360 deg, then shifting the detector in 2theta by
a degr
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